Comm 4-pin XLR Connector Wiring Diagram

I and fellow engineer friends like taking the audio output from an analog comm unit and turn it into a 3-pin XLR cable to input into say a monitor desk so when we are monitor engineering, we can always have the comm sent to our cue unit for instance.

Every time we go to make one though…can never remember what pins on the 4-pin connector are what!  Here’s the diagram for our own sake and yours if you wish to follow the same technique.  Take pins 3 and 4 to pins 2 and 3 on a standard XLR and you have the audio.

4-pin XLR Comm Wiring Diagram

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  • Alexander Marshall

    Thank you! I’ve been looking everywhere for a diagram of converting 4 pin XLR to 3 pin XLR! One question, do you solder the shield to pin 1 of the 3 pin XLR? or does the 4 pin XLR not use a shield? Thanks again!

    [Reply]

  • http://blog.mattsatorius.com/ Sators

    Shield not connected.

    [Reply]

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  • Landon Harris

    This is wrong if you are using the “Clear Com” system. Pin 1 should be mic – and shield. Pin 2 should be mic +

    [Reply]

  • Michael

    Do you know if I would then be able to use the coms mic for talk back through the sound desk? And how successful has your set up been/ do you have any photos of the finished product? Sorry for asking allot of questions but I am planning on using this with other people’s systems so I don’t want to go wrong.
    Thanks.

    [Reply]

    Sators reply on February 23rd, 2013:

    Well, in theory sure, if you take the mic pins and wire those to a mic input + and – to a console…that should work…might want to make sure phantom power is off to start…

    [Reply]

    Michael reply on February 24th, 2013:

    Thank you so much for your help.

    [Reply]